摘要
设计和制作了三段式锁固型岩质边坡模型,并进行了大型振动台试验,对三段式锁固型岩质边坡在地震作用下的动力响应和变形破坏模式进行了分析.研究结果表明:三段式锁固型边坡模型的自振频率随振动次数的增加而逐渐降低,阻尼比则随振动次数的增加而逐渐增大;边坡模型水平加速度放大系数表现出明显的高程放大效应和趋表效应;在不同类型输入波的作用下,边坡加速度响应存在着明显的差异;加速度放大系数随着输入波频率的增加表现出先增加后减小的变化规律,且在频率为15 Hz时峰值加速度放大系数达到最大值;随着输入波振幅的增加,坡体加速度放大系数总体上表现为先增加后减小的变化趋势;在地震波的作用下,位于坡体顶部裂缝和底部软弱夹层之间的锁固段出现多条裂缝,并不断发展呈X型贯通,最终在坡体内部形成3级滑面,并在持续的振动作用下,边坡沿着3级滑面发生滑动破坏.
A three sections locked rock slope model was designed and produced,and a large-scale shaking table test was carried out to analyze the dynamic response and deformation failure mode of the three sections locked rock slope under earthquake action.The research results show that the natural vibration frequency of the three sections locked slope model decreases gradually with the increase of vibration times,and the damping ratio increases gradually with the increase of vibration times;the horizontal acceleration amplification factor of the slope model shows obvious elevation amplification effect and surface effect.Under the action of different types of input waves,there are obvious differences in the slope acceleration response:the acceleration amplification coefficient increases first and then decreases with the increase of input wave frequency,and the peak acceleration amplification coefficient reaches the maximum value when the frequency is 15 Hz.With the increase of the amplitude of the input wave,the acceleration amplification coefficient of the slope increases first and then decreases.Under the action of seismic wave,multiple cracks appear in the locking section between the crack at the top of the slope and the weak interlayer at the bottom,and continue to develop in an X-shaped connection.Finally,a 3-level slip surface is formed in the slope,and the slope slides along the 3-level slip surface under the action of continuous vibration.
作者
王闯
董金玉
刘汉东
黄志全
赵亚文
杨兴隆
Wang Chuang;Dong Jinyu;Liu Handong;Huang Zhiquan;Zhao Yawen;Yang Xinglong(Research Institute of Geotechnical Engineering and Hydraulic Structure,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;School of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2022年第12期4428-4441,共14页
Earth Science
基金
国家重点研发计划项目(No.2019YFC1509704)
国家自然科学基金项目(Nos.U1704243,41741019,41977249,42090052)
中原科技创新领军人才计划(No.214200510030)
河南省重点研发专项(No.221111321500)
华北水利水电大学高层次人才引进项目(No.202111002).
关键词
三段式锁固型岩质边坡
大型振动台试验
动力输入参数
动力响应
破坏模式
岩土工程
three sections locked rock slope
large-scale shaking table test
dynamic input parameters
dynamic response
failure mode
geotechnical engineering
作者简介
王闯(1991-),男,博士,讲师,主要从事岩土体动力特性方面的研究工作.ORCID:0000-0002-9157-0417.E-mail:wangchuang@ncwu.edu.cn;通讯作者:董金玉,博士,教授,主要从事岩土体动力特性方面的研究工作.E-mail:dongjy0552@126.com。
